00:00 Do you see this red can? Some see it, others don't, but there is no red pixel on your screen.
00:04 If you take a screenshot and zoom in, you will get this sign. It's white, black and blue.
00:08 But if you unzoom in, you will return to the scene of the red Coca-Cola can.
00:11 It was exactly the same with this famous dress.
00:13 The Japanese psychologist Akiyoshi Kitaoka, famous for having created his illusion of peripheral drift,
00:17 likes to post his images on social networks. Here is another one.
00:20 But concretely, what's going on?
00:21 Well, your brain determines the color of things by ignoring the color of the light source.
00:25 For example, if a yellow lamp illuminates an apple,
00:27 our brain will still see the red apple because it ignores the yellow light.
00:30 To make it simple, what we perceive as different colors
00:32 are actually different wavelengths of light, ranging from 390 to 700 nanometers.
00:37 Different wavelengths of light activate three types of photoreceptors inside your eyes
00:41 and send unique signals to the visual cortex of your brain.
00:43 It then combines this information with other clues about your situation
00:47 to produce the experience we call "color".
00:49 Besides, we can break the illusion by holding a red object in front of us.
00:51 The red seems to disappear.
00:52 Remove it and your brain will start filling in the red again.
00:55 In summary, this shows us how much our brain makes up our perception of colors
00:58 by mixing light with our past experiences,
01:01 revealing how subjective what we see is.
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